Which trade is it?
One definition, four trades. Pick the one it belongs to.
Metamorphic rock composed mostly of amphibole, plagioclase, with lesser amounts of epidote, zoisite, chlorite, quartz, titanite, and accessory leucoxene, ilmenite and magnetite derived from an igneous rock.
Get the Word of the Day
One industrial term every day, with the trade it belongs to and why it is worth knowing. No advertising.